A Database Error Occurred

Error Number: 1055

Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'kaff2013.program_film.program_film_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT program_film_id,program_film_order, entry_video_film_format,entry_video_subtitle,entry_dialog_text,entry_audio,entry_aspect_ratio,program_film_film_id, program_film_program_id, program_id, program_name, program_description, entry_id, entry_title_hu,entry_title_en, entry_length,entry_production_date,entry_class, SUM(TIME_TO_SEC(entry_length)) as lengthsum, COUNT(entry_id) as countfilm FROM entries LEFT OUTER JOIN program_film ON entry_id=program_film_film_id LEFT OUTER JOIN programs ON program_id=program_film_program_id WHERE program_film_program_id =105 GROUP BY entry_id ORDER BY program_film_order